Improvement in micrometer-regulators for watches



C. V. WOERD'. Miorometer-Regulator for Watches.

No. 197,710. Patented Nov. 27,1871.

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UNITED STATES PATENT OEEIoE.

GHARLE S VNVOERD, OF WALTHAM, MASSACHUSETTS, AS SIGNOR TO AMERICAN YVATOH COMPANY, OF SAME PLACE.

IMPROVEMENT IN MICROMETE R-REGULATORS FOR WATCHES.

Specification forming part of Letters Patent No. 197,710, dated November 27, 1877; application filed November 3, 1877.

To all whom it may concern:

Be it known that I, CHARLES V. WoERn, of W'altham, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in MicrometerRegulators for latches, which improvement is fully set forth in the following specification, reference being had to the accompanying drawings.

The object of my invention is a micrometerregulator which is free from many imperfections found in those now in use, and which combines simplicity of form with regularity of motion and extreme delicacy of adjustment; and my invention consists inproducing a micrometer-regulator which insures regularity and uniformity of motion, in such a manner that equal distances moved by the pointer on the index-plate causes also equal distances to be passed by the regulating-arm, and the prevention of all backlash; and I accomplish this by constructing the regulator in two pieces, one of which is an ordinary ring movable about the axis of the balance, and terminating in a projection holding the curb pins, and provided with two slightly-flexible arms, the latter being operated by the second piece, which is a heart-shaped cam with pointer.

Referring to the drawing, A represents the top plate of a watch, with the index-plate a attached thereto. B is the cock. To the circular projection at the upper end is snapped the ring b, with the projection or regulating-arm c, and the two curved and elastic arms (I e, which, for the purpose of preventing all slackness caused by wear, are sprung against the curves of the heart-shaped cam h, which latter is pivoted at r, and has attached to it the index i, pointing to the divisions of the scale on the index-plate a.

It will be seen that the ratio of the pointer iand curved arms (Z e to the eccentricity of cam h and regulatingarm c is so great that the motion of the llldGXi for every division on the scale produces but a very minute motion of arm 0, by which the acting part of the hair-spring is lengthened or shortened; and, further, that the distance between the points of contact of the arms (I 6 with the cam it remains always the same, whatever may be the position of the cam, and also the rise and descent of these points are equal for equal angular motions of the cam; consequently the motion of arm 0 will also be equal and uniform; but the angular motion of the cam h is produced by the position of the pointer 2', and therefore equal motions of the pointer 11 result in equal motions of arm 0. The points of the arms (I a being always in contact with the curves of the cam, no backlash or any other disturbance can possibly occur to arm 0 until the index i is set in motion.

By this simple and neat mechanism great security and nicety of adjustment of the hairspring is obtained, and a most useful micrometer-regulator added to the improvement in watches.

\Vhat I claim as my invention, and desire to secure by Letters Patent, is

A micrometer-regulator for watches, consist ing of the heart-shaped cam h, with index i, in combination with the arms (I e, constructed and operated substantially as above described.

GHA S. V. WVOERD.

itnesses WM. H. WRENN, M. WILDE. 

